Swivel chair



FIG. 1 is a perspective view of a swivel chair embodying my new and ornamental design;

FIG. 2 is front elevation view thereof on an enlarged scale;

FIG. 3 is a side elevation view thereof on an enlarged scale;

FIG. 4 is a top plan view thereof on an enlarged scale;

FIG. 5 is a rear elevation view thereof on an enlarged scale; and

FIG. 6 is a bottom plan view thereof on an enlarged scale.

The side of the chair not shown is a mirror image of the side shown in FIG. 3. 

The ornamental design for a swivel chair, as shown and described. 